The combined share of dogs, cats and primates in research animals is:

• A. <1%
• B. 25%
• C. 50%
• D. 5%

Answer: (A)

The idea being tested is how little dogs, cats, and nonhuman primates contribute to the total pool of animals used in research. In practice, the bulk of research animals are rodents—especially mice and rats—with birds and other species making up the rest. The three species together account for a very small slice, typically less than one percent of all animals used. This reflects both the practicality and cost of rodent models and the heavier regulatory and public scrutiny applied to dogs, cats and primates, while still ensuring these species receive protections. So the correct interpretation is that their combined share is under 1%.